dj119 Posted October 2, 2018 Share Posted October 2, 2018 I have a 1973 Dodge motor home with a 440 I recently replaced distributor cap rotor ecu ballast resistor . It was running great until earlier today . I was driving and I tried to excellerate and it backfired extremely load out of the exhaust it died and it has been back firing extremely load when I try to start it and it won't start . Any help would be greatly appreciated thankyou . Link to comment Share on other sites More sharing options...
Alan Cutler Posted October 2, 2018 Share Posted October 2, 2018 Sounds like you have either your cap 180 degrees out, or you crossed spark plug wires...sometimes backfires indicate the timing is off... I'd go back and check your firing order and ensure your wires are correct and verify your cap is not 180 degrees off. Link to comment Share on other sites More sharing options...
Guest Posted October 2, 2018 Share Posted October 2, 2018 If it was running fine how would the wires get crossed while in motion. I would think if the timing is messed up it is timing gears or chain. Link to comment Share on other sites More sharing options...
Alan Cutler Posted October 2, 2018 Share Posted October 2, 2018 (edited) Crossed wires run, albeit rough, but under a load they tend to backfire.... Sounds like the reason you can not start now, is your resistor, how many volts are running through it...does it start and then immediately dies? Edited October 2, 2018 by Surf City '38 (see edit history) Link to comment Share on other sites More sharing options...
Spinneyhill Posted October 3, 2018 Share Posted October 3, 2018 Does a failing ecu cause any of these symptoms? Such a thing could fail suddenly? Link to comment Share on other sites More sharing options...
28 Chrysler Posted October 3, 2018 Share Posted October 3, 2018 I would start by checking the timing. Timing chain is the most likely but the gear on the distributor could also be a problem. The resister lowers the voltage to the coil in the ignition key's run position, it is bypassed in the start position. 1973 the electronic ing. system is a simple optical pickup, they work or they just quit in most cases. Link to comment Share on other sites More sharing options...
Yoda Posted October 28, 2018 Share Posted October 28, 2018 i agree with Tinindian. Maybe jumped timing. Check timing chain & gears Link to comment Share on other sites More sharing options...
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